ruby server demo from website crashes.

[ssoroka]

Copying the demo from the website, I have:

require 'faye'
faye_server = Faye::RackAdapter.new(:mount => '/faye', :timeout => 45)
run faye_server

then I copy the client demo and run it, but the server dies with:

Rack::Lint::LintError: Status must be >=100 seen as integer
/Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/rack-1.2.1/lib/rack/lint.rb:19:in assert' /Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/rack-1.2.1/lib/rack/lint.rb:425:incheck_status'
/Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/rack-1.2.1/lib/rack/lint.rb:50:in _call' /Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/rack-1.2.1/lib/rack/lint.rb:36:incall'
/Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/rack-1.2.1/lib/rack/showexceptions.rb:24:in call' /Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/rack-1.2.1/lib/rack/commonlogger.rb:18:incall'
/Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/rack-1.2.1/lib/rack/content_length.rb:13:in call' /Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/rack-1.2.1/lib/rack/chunked.rb:15:incall'
/Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/thin-1.2.7/lib/thin/connection.rb:76:in pre_process' /Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/thin-1.2.7/lib/thin/connection.rb:74:incatch'
/Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/thin-1.2.7/lib/thin/connection.rb:74:in pre_process' /Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/thin-1.2.7/lib/thin/connection.rb:57:inprocess'
/Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/faye-0.5.2/lib/thin_extensions.rb:44:in receive_data' /Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:inrun_machine'
/Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in run' /Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/thin-1.2.7/lib/thin/backends/base.rb:57:instart'
/Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/thin-1.2.7/lib/thin/server.rb:156:in start' /Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/rack-1.2.1/lib/rack/handler/thin.rb:14:inrun'
/Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/rack-1.2.1/lib/rack/server.rb:213:in start' /Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/rack-1.2.1/lib/rack/server.rb:100:instart'
/Users/steven/.rvm/gems/ree-1.8.7-2010.02/gems/rack-1.2.1/bin/rackup:4
/Users/steven/.rvm/gems/ree-1.8.7-2010.02/bin/rackup:19:in `load'
/Users/steven/.rvm/gems/ree-1.8.7-2010.02/bin/rackup:19
127.0.0.1 - - [27/Aug/2010 13:22:17] "POST /faye HTTP/1.1" 500 62371 0.0206

[jcoglan]

That's because Rack's development middleware doesn't work with Thin async responses. You can run your app in production mode to prune out the Lint middleware:

rackup -s thin -E production config.ru

Maybe I need to make this more prominent on the website; you're not the first person to report this problem.

[ssoroka]

Good to know. I actually was using -E production .. I wasn't seeing any output, so I switched to development thinking it'd log the errors. If those errors aren't related, I'll have to figure out why it wasn't working...

[ssoroka]

seems to be working now. I must have made a simple mistake.

[KieranP]

OH! Please!! I spent hours trying to track this down. :-( Please kill the server with a meaningful error if it doesn't work in development.

e.g.

raise NotSupported.new("Please run in production mode") if RACK_ENV != 'production'

[jcoglan]

The issue is really the the middleware that Rack uses in development mode happens not to understand Thin async responses. To make this really robust you would need to detect the presence of such middlewares higher up the stack, since the user may add them manually even if Rack does not. Just checking for production environment is too removed from the real problem to be of use.

This is the sort of thing that is best worked around with clear documentation -- does the website need clarifying?

[axyjo]

I just ran into this again, please do document this on the website stating that even in development, production mode should (rather, must) be used.

[jcoglan]

It's here in the docs: http://faye.jcoglan.com/ruby.html. Where else should I put it so this stops happening?

[axyjo]

I see that the command:

rackup config.ru -s thin -E production

is present in the documentation. However, I assumed that the environment option was merely to be used in deployment, so I omitted that on my development machine. I think that the fact that it must be run in production mode even on development machines should be documented. Thanks!

[andrewhavens]

What am I supposed to do if I am mounting the Faye::RackAdapter as part of my Sinatra application? I can't run my application in production mode when it's supposed to be running in development.

[jcoglan]

@andrewhavens Run that app using thin start -R config.ru. This will not add the Rack development middlewares that cause async requests to fail.

[mattconnolly]

I looked in that above linked documentation page. Then I came across the error, then this thread. There is no mention of "production", "development" nor "environment" in that docs page in its current version.

[jcoglan]

@mattconnolly The docs link to this page that explains how to run Faye with various different web servers. This thread dates from a time when we only supported Thin.